Relief valve adjustment

[Fast eddy 007]

Where is the relief valve on a ford 1715? The loader valve sounds like it is dumping all the time.the front bucket lifts up and down but makes a wining sounds.i can lift a full bucket of snow but it sounds like its relief is by passing.i replace the clutch and did change the hydraulic oil and filter.does not matter if it is cold or hot i do let it run until its hot because it is a diesel.i look in the manual by can稚 find the relief any where.the tractor is a 1996.i removed some nuts on the loader valve no place to adjust is there any relief on the diverted valve?is my pump failing?thanks for any help fasteddy Saco,me.

 

[DJ54]

Maybe this link from New Holland parts will help.Official New Holland Online Parts Store and Online Parts Catalog for New Holland and Ford Tractors. There were 7 different 2 spool remotes used on various models. You'll just have to figure out which one matches yours. The first one I looked at shows like 2 different main relief valves, one for each side. There are adjusting screws to regulate the pressure. They are not called relief valves, just valves. Then in the side of the control, looks like 2 more, just regulated by non adjustable springs.

It sounds like a small piece of debris may be between one of the relief valves, and it's seat, letting oil bypass all the time. Or, a broken/weak spring.

 

[Fast eddy 007]

Thanks for your help appreciate it.

 

[Dave M7040]

How do you know you have a relief valve issue when you have not done the most basic test of measuring the hydraulic pressure.

A gauge and quick connect like this is less than $30 at most independent hydraulic shops locally or on line.

Have you been disconnecting FEL hoses? Hoses in the wrong place make funny things and noises happen.

Dave M7040

 

[MitchellB]

Probably not necessary, but after I had trouble with my hydraulic system I mounted a gauge permanently on my 861D's pump so that I can see at a glance what my pressure is from the driver's seat. I forget what I paid for the gauge, but found it on eBay pretty cheap.

 

[DwayneB]

Thanks for your help appreciate it.

Post an update if you figure this out. I have a friend's tractor doing almost the same thing. When he tries to move the loader it just squeals.
I don't know much but, I'm driving to him next week to see what I can figure out. He took some pics but I can't tell much from them other than there are 2 quick connects that supply the loader valve which is mounted between the frame and the tractor with a cover over it.
It must be getting fluid since the relief is tripping. Maybe not getting back to the sump or the relief valve is stuck open. The 3 point operates ok.
From the pics he sent it looks like a PITA to get to the loader valve.

 

[Dave M7040]

View attachment 555743 Probably not necessary, but after I had trouble with my hydraulic system I mounted a gauge permanently on my 861D's pump so that I can see at a glance what my pressure is from the driver's seat. I forget what I paid for the gauge, but found it on eBay pretty cheap.

I make this comment because I am concerned with your safety not because I want to criticize your work.

You have used a iron plumbing fitting, a street elbow to be exact, to mount your gauge to. Plumbing fittings are not designed for hydraulic system operating pressures and can crack. A high pressure jet of hydraulic fluid can be injected right through your skin. Same for the brass reducing bushing.

Hydraulic fittings are not expensive.

Dave M7040

 

[Dave M7040]

Post an update if you figure this out. I have a friend's tractor doing almost the same thing. When he tries to move the loader it just squeals.
I don't know much but, I'm driving to him next week to see what I can figure out. He took some pics but I can't tell much from them other than there are 2 quick connects that supply the loader valve which is mounted between the frame and the tractor with a cover over it.
It must be getting fluid since the relief is tripping. Maybe not getting back to the sump or the relief valve is stuck open. The 3 point operates ok.
From the pics he sent it looks like a PITA to get to the loader valve.

The major question to answer before you visit is does the FEL have 6 or 7 hoses or ports.
Post your friends pics here.

Dave M7040

 

[DwayneB]

The major question to answer before you visit is does the FEL have 6 or 7 hoses or ports.
Post your friends pics here.

Dave M7040

I'll try. Been a long time since I posted any pics. I doubt it will help you because the valve is hidden under a cover that needs to be removed.

 

[DwayneB]

Trying the pictures

 

[DwayneB]

The major question to answer before you visit is does the FEL have 6 or 7 hoses or ports.
Post your friends pics here.

Dave M7040

Can't tell much from the pics he sent. I'm assuming the 7th hose if it has one is for power beyond? This guy was no help at all I couldn't even get him to take the cover off and tell me how many lines were attached to the valve. The loader used to work, it just quit. He replace the hydraulic pump before he called me.

 

[MitchellB]

I make this comment because I am concerned with your safety not because I want to criticize your work.

You have used a iron plumbing fitting, a street elbow to be exact, to mount your gauge to. Plumbing fittings are not designed for hydraulic system operating pressures and can crack. A high pressure jet of hydraulic fluid can be injected right through your skin. Same for the brass reducing bushing.

Hydraulic fittings are not expensive.

Dave M7040

Thanks for info. I was not aware I needed hydraulic specific fittings. I'll look into replacing them.

 

[Dave M7040]

Thanks for info. I was not aware I needed hydraulic specific fittings. I'll look into replacing them.

Thanks for taking my advice seriously.

Dave M7040

 

[radios1]

it's also very costly, and dangerous to adjust the relief valves to a higher pressure than designed!.. be careful!.. I've seen the results of this,(other people) loader arms broken, needed to be welded, and luckily, no blown hydraulic hoses that can inject oil under your skin yet, but it has happened to some..

 

[DwayneB]

The major question to answer before you visit is does the FEL have 6 or 7 hoses or ports.
Post your friends pics here.

Dave M7040

I went and looked at the tractor. It has 7 hoses. The power from the hydraulic pump goes to a block under the right floorboard. From that block a line goes to the 3-point and 3 lines come out the front of the block and go to to a prince loader valve. I took the pressure relief valve apart and cleaned it all up but no luck. The 3-point lift is working fine but, the loader valve has almost no power. The bucket will curl down enough to lift the loader arms high enough to keep it from dragging the ground but it doesn't have enough power to raise the loader. I'm thinking the o-rings must be bad on both spool valves or the valve seats are completely worn out.
I must admit I don't fully understand why there a 3 lines plumbed from the block to the valve as the TPH seems to be getting it's power through the block anyway. you can tell it was installed by the factory or a dealer. The tractor is a 1720.

 

[Dave M7040]

I went and looked at the tractor. It has 7 hoses. The power from the hydraulic pump goes to a block under the right floorboard. From that block a line goes to the 3-point and 3 lines come out the front of the block and go to to a prince loader valve. I took the pressure relief valve apart and cleaned it all up but no luck. The 3-point lift is working fine but, the loader valve has almost no power. The bucket will curl down enough to lift the loader arms high enough to keep it from dragging the ground but it doesn't have enough power to raise the loader. I'm thinking the o-rings must be bad on both spool valves or the valve seats are completely worn out.
I must admit I don't fully understand why there a 3 lines plumbed from the block to the valve as the TPH seems to be getting it's power through the block anyway. you can tell it was installed by the factory or a dealer. The tractor is a 1720.

The loader spool valves are, in the serious places, assembled without seals as the manufacturing tolerances between the spool and the valve body are so tight. Talking a valve apart is never going to make things better.

A seven line Loader valve means the valve has been modified using a special plug or sleeve to provide power beyond which is a circuit being fed with high pressure oil from the loader valve.

Unless you have proof, so cannot assume it is a factory install as using hydraulic blocks to add a FEL is a solution for an owner working on his own tractor.

Most likely, a hose is in the wrong place.Try cleaning up the top and sides of the loader body looking for letters cast into the valve body. Letters like P, T, PB. Try and figure out what else ( another valve, 3 pt hitch, rear remotes) are being supplied from the loader valve block though the seventh hose.

A simple loader valve installation has 6 lines. One returning fluid to the tank, reservoir or transmission, one feeding the valve with oil from a hydraulic block, and then 4 "work ports," for the actual cylinders for the lift arms and bucket.

Please try and find more history as it will be a big clue. Was the tractor bought with the loader that came from Japan. Was the loader installed locally by the dealer, did the loader ever work OK.

Dave M7040

 

[DwayneB]

The loader spool valves are, in the serious places, assembled without seals as the manufacturing tolerances between the spool and the valve body are so tight. Talking a valve apart is never going to make things better.

A seven line Loader valve means the valve has been modified using a special plug or sleeve to provide power beyond which is a circuit being fed with high pressure oil from the loader valve.

Unless you have proof, so cannot assume it is a factory install as using hydraulic blocks to add a FEL is a solution for an owner working on his own tractor.

Most likely, a hose is in the wrong place.Try cleaning up the top and sides of the loader body looking for letters cast into the valve body. Letters like P, T, PB. Try and figure out what else ( another valve, 3 pt hitch, rear remotes) are being supplied from the loader valve block though the seventh hose.

A simple loader valve installation has 6 lines. One returning fluid to the tank, reservoir or transmission, one feeding the valve with oil from a hydraulic block, and then 4 "work ports," for the actual cylinders for the lift arms and bucket.

Please try and find more history as it will be a big clue. Was the tractor bought with the loader that came from Japan. Was the loader installed locally by the dealer, did the loader ever work OK.

Dave M7040

I found a diagram online of the block on the tractor. It is using power beyond to feed back to a port on the block. I'm assuming the block is plumbed internally to do this. Since the TPH is receiving power from the loader valve and it has plenty of power I'm thinking this guys best option is replace the old valve with a new one. He just needs a 2 spool valve with power beyond capability? This diagram, although not his valve, has a picture of the block under the floorboard. I checked all the hoses twice. Everything is where it should be.